In a clustered system, the Unwired Server components and data tier components are installed by separate installation procedures (possibly on the same host, but typically on separate hosts).
It can be scaled by adding or subtracting servers (nodes in a cluster), to adapt to changes in system load or performance requirements.
Redundant cluster nodes allow conventional load-balancing and failover mechanisms to provide higher system availability.
In a typical clustered system, Unwired Server instances do not share host system resources with data tier servers.
You should choose a clustered system design to meet requirements for scalability, higher availability, and overall higher system performance.